A Berlin exhibition of works from Tehran’s Museum of Contemporary Art has been postponed, after Iranian authorities have failed to allow the collected paintings to leave the country. “We had signed contracts with the TMoCA and relations are on a good footing, but we are told someone needs to give the green light for the artworks to leave Tehran, and that signature is still missing, though the current signals we’re getting indicate we’ll get them soon,” a spokesperson for exhibition organizers the Prussian Cultural Heritage Foundation said.